The Kepler-454 System: A Small, Not-rocky Inner Planet, a Jovian World, and a Distant Companion

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The Kepler-454 System: A Small, Not-rocky Inner Planet, a Jovian World, and a Distant Companion

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Title: The Kepler-454 System: A Small, Not-rocky Inner Planet, a Jovian World, and a Distant Companion
Author: Gettel, Sara; Charbonneau, David; Dressing, Courtney D.; Buchhave, Lars A.; Dumusque, Xavier; Vanderburg, Andrew Michael; Bonomo, Aldo S.; Malavolta, Luca; Pepe, Francesco; Cameron, Andrew Collier; Latham, David Winslow; Udry, Stéphane; Marcy, Geoffrey W.; Isaacson, Howard; Howard, Andrew W.; Davies, Guy R.; Aguirre, Victor Silva; Kjeldsen, Hans; Bedding, Timothy R.; Lopez, Eric; Affer, Laura; Cosentino, Rosario; Figueira, Pedro; Fiorenzano, Aldo F. M.; Harutyunyan, Avet; Johnson, John Asher; Lopez-Morales, Mercedes; Lovis, Christophe; Mayor, Michel; Micela, Giusi; Molinari, Emilio; Motalebi, Fatemeh; Phillips, David F.; Piotto, Giampaolo; Queloz, Didier; Rice, Ken; Sasselov, Dimitar D.; Ségransan, Damien; Sozzetti, Alessandro; Watson, Chris; Basu, Sarbani; Campante, Tiago L.; Christensen-Dalsgaard, Jørgen; Kawaler, Steven D.; Metcalfe, Travis S.; Handberg, Rasmus; Lund, Mikkel N.; Lundkvist, Mia S.; Huber, Daniel; Chaplin, William J.

Note: Order does not necessarily reflect citation order of authors.

Citation: Gettel, Sara, David Charbonneau, Courtney D. Dressing, Lars A. Buchhave, Xavier Dumusque, Andrew Vanderburg, Aldo S. Bonomo, et al. 2016. The Kepler-454 System: A Small, Not-rocky Inner Planet, a Jovian World, and a Distant Companion. The Astrophysical Journal 816, no. 2: 95. doi:10.3847/0004-637x/816/2/95.
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Abstract: Kepler-454 (KOI-273) is a relatively bright (V = 11.69 mag), Sun-like star that hosts a transiting planet candidate in a 10.6 day orbit. From spectroscopy, we estimate the stellar temperature to be 5687 ± 50 K, its metallicity to be [m/H] = 0.32 ± 0.08, and the projected rotational velocity to be v sin i < 2.4 km s−1. We combine these values with a study of the asteroseismic frequencies from short cadence Kepler data to estimate the stellar mass to be ${1.028}_{-0.03}^{+0.04}{M}_{\odot }$, the radius to be 1.066 ± 0.012 R⊙, and the age to be ${5.25}_{-1.39}^{+1.41}$ Gyr. We estimate the radius of the 10.6 day planet as 2.37 ± 0.13 R⊕. Using 63 radial velocity observations obtained with the HARPS-N spectrograph on the Telescopio Nazionale Galileo and 36 observations made with the HIRES spectrograph at the Keck Observatory, we measure the mass of this planet to be 6.8 ± 1.4 M⊕. We also detect two additional non-transiting companions, a planet with a minimum mass of 4.46 ± 0.12 MJ in a nearly circular 524 day orbit and a massive companion with a period >10 years and mass >12.1 MJ. The 12 exoplanets with radii <2.7 R⊕ and precise mass measurements appear to fall into two populations, with those <1.6 R⊕ following an Earth-like composition curve and larger planets requiring a significant fraction of volatiles. With a density of 2.76 ± 0.73 g cm−3, Kepler-454b lies near the mass transition between these two populations and requires the presence of volatiles and/or H/He gas.
Published Version: doi:10.3847/0004-637x/816/2/95
Other Sources: https://arxiv.org/pdf/1511.09097.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:30410812
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